140 



PROCEEDINGS OF THE NATIONAL MUSEUM 



In an attempt to provide more characters for the identification 

 of the species in the larger groups, mainly in the genera Caligus 

 and Lepeophtheirus, the position and composition of the articular 

 surfaces in some of the appendages (the second antenna, maxilla, and 

 maxilliped) have been given. This characteristic appears to be con- 

 stant although its later use and applicability in the separation of the 

 species should determine its value. 



The thoracic leg armature table used by Shiino in his series of pub- 

 lications on caligoid copepods has been adopted with slight modifi- 

 cations by the present author. Such a table gives the number and 

 approximate position of the membranes, spines, and setae found on 

 the first four pairs of thoracic legs. A hypothetical thoracic leg is 

 shown in figure 1, which designates all of the component parts of the 

 armament of the thoracic legs discussed in tabular form in this work. 



A table of the hypothetical thoracic leg is given below. When 

 applied to a margin, the term "inner" means that margin closest to 

 the median longitudinal axis of the body of the copepod, the term 

 "outer" indicates that margin furthest from the median longitudinal 

 axis, and the term "middle" indicates that margin between the two 

 rami, applying only to the protopodite. The term "seta" designates 

 a slender, flexible structure that may or may not be plumose. The 

 term "setule" is used to indicate a small seta whether single (s) or 

 forming a fringe (C, c). The term "spine" is used to indicate a stiff, 

 sharply pointed or blunt-tipped projecting process. (For a complete 

 explanation of symbols, see figure 1.) 



Under "Remarks" the author compares the described species with 

 species that have morphological similarities. Since this work deals 

 with caligoids found on Hawaiian fishes, the comparison primarily 

 involves Indo-Pacific caligoids. Copepods from areas other than this 

 region are used in comparison only if the resemblance to the described 

 form is striking. 



